Finding the Fourth Proportional to 2,109.21, 2,911.22 and 1,224.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.21 : 2,911.22 = 1,224.88 : x
2. Step 2: Convert to fraction form
   2,109.21/2,911.22 = 1,224.88/x
3. Step 3: Cross multiply
   2,109.21x = 2,911.22 × 1,224.88
4. Step 4: Simplify right side
   2,109.21x = 3,565,895.15
5. Step 5: Solve for x
   x = 3,565,895.15/2,109.21
6. Step 6: Final answer
   x = 1,690.63